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The tubes might be really old and they will feedback non-stop if this is the case. You could have the pull bright and fat switches engaged with really high presence settings, which will make this amp feedback non-stop! Try turning the gain down and compensating by turning the drive up, which seems to reduce it somewhat. Try decreasing the high EQ a bit on the graphic EQ.
My Mark IV had feedback when I got it because of old-ass tubes. Changing them helped a lot.
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"Ah, she's built like a steakhouse but she handles like a bistro" - ZB
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